18537489 has 6 divisors (see below), whose sum is σ = 26776386. Its totient is φ = 12358320.

The previous prime is 18537437. The next prime is 18537499. The reversal of 18537489 is 98473581.

It can be written as a sum of positive squares in only one way, i.e., 9734400 + 8803089 = 3120^2 + 2967^2 .

It is not a de Polignac number, because 18537489 - 2¹² = 18533393 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18537499) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1029852 + ... + 1029869.

It is an arithmetic number, because the mean of its divisors is an integer number (4462731).

Almost surely, 2^18537489 is an apocalyptic number.

It is an amenable number.

18537489 is a deficient number, since it is larger than the sum of its proper divisors (8238897).

18537489 is a wasteful number, since it uses less digits than its factorization.

18537489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2059727 (or 2059724 counting only the distinct ones).

The product of its digits is 241920, while the sum is 45.

The square root of 18537489 is about 4305.5184356823. The cubic root of 18537489 is about 264.6571524503.

The spelling of 18537489 in words is "eighteen million, five hundred thirty-seven thousand, four hundred eighty-nine".